Bottom construction for laminated containers



' D. c. SHEPARD Jan. 28, 1936.

BOTTOM CONSTRUCTION FOR LAMINATED CONTAINERS I 2 Sheets$heet 1 Filed Feb. 27, 1935 David C. Shepard Jam 1936- D. c. SHEPARD BOTTOM CONSTRUCTION FOR LAMINATED CONTAINERS Filed Feb. 27, 1933 2 Sheets-Sheet 2 20 Fig. 6

David Shepard Patented Jan. 28, 1936 UNITED STATES PATENT OFFICE BOTTOM CONSTRUCTION FOR LAliflNATED CONTAINERS 11 Claims.

My invention relates to bottom construction for laminated containers and has for its object to provide a bottom formed of sheets of paper constructed without waste.

Another object of the invention resides in constructing the bottom with a circular body portion adapted to extend across the lower end of the .wall structure of the container and a flange formed with a feathered edge for attachment to the wall structure.

A still further object of the invention resides in constructing the wall structure of the container with a wedge-shaped annular recess opening through one end thereof in which the feathered flange of the bottom is received.

An object of the invention resides in constructing the flange of the bottom with tongues, said tongues being spaced from one another to cause the same to readily accommodate themselves to the contour of the surface of the wall structure to which they are applied. 7 7

Another object of the invention resides in constructing the bottom from square sheets of paper glued one upon the other and progressively rotated with respect to each other to uniformly distribute the corners of the sheets about the periphery of the bottom.

An object of the invention resides in the method of forming containers which consist in applying to the end or" a mandrel a bottom having a circular body portion and a flange extending outwardly therefrom with its outer surface in continuation with the outer surface of the mandrel, in applying a number of sheets of paper to the mandrel with the lower edges thereof extending up to the end of the container, in turning back the tongues upon the portion of the container so formed and gluing the same thereto, in applying other sheets of paper to the portion of the wall structure so formed with the lower edges thereof projecting outwardly beyond the lower end of the container and in individually turning back said projecting portions of the last-named sheets upon the inner surface of the flange of the bottom and in gluing the same to said flange and to one another.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

In the drawings:

Fig. 1 is a perspective view of a container constructed in accordance with my invention.

Fig. 2 is a developed view of an unformed bottom illustrating the manner of arranging the 7 sheets from which the bottom is constructed.

Fig. 3 is a perspective view of a formed bottom illustrating the same prior to its application to the container wall structure.

Fig. 4 is a perspective view showing the bottom structure mounted against the end of the mandrel and the first sheets of the wall structure applied thereto.

Fig. 5 is a view similar to Fig. 4 illustrating the tongues turned back upon the outer surface of 5 the first formed portion of the wall structure.

Fig. 6 is a sectional detail view taken on line 6-6 of Fig. 4.

Fig. 7 is a sectional detail view taken on line 1-! of Fig. 1.

In the construction of laminated containers and particularly paper containers with inset bottoms, it has heretofore been the custom to construct the bottom for the container out of circular sheets of paper glued together and attached to the wall structure of the container in various ways. Such construction incurs an appreciable amount of waste of material for which no use has heretofore been found. The present invention provides a container in which square sheets of paper may be used in the construction of the bottom of the container so that no waste of material results.

In Fig. 1 I have shown a container which is indicated in its entirety at A and which is particularly adapted to be used for shipping butter and similar commodities. This container comprises a wall structure In in the shape of a frustrum of a cone which is open at its upper end as indicated at H and which is provided at its lower end with a bottom l2 (Fig. '7). At the upper open end ll of the container A is provided a hoop 3| which encircles the free end of the wall structure 10 and which stiffens and reinforces the container at such locality. Another hoop 32 at the lower end of the container serves a similar purpose. These various parts and the method of forming the same will now be described in detail.

The bottom I2 is constructed to provide a cir- 40 cular body portion l4 adapted to flt into the interior of the lowermost end of the wall structure 10 of the container and to close the same and is further constructed with a flange I5 extending outwardly from said body portion. This flange is feathered at the free end [6 thereof for a purpose to be presently described in detail. The bottom I2 is constructed from a number of sheets of paper l3 best shown in Fig. 2. These sheets are all square in form and are of a width somewhat greater than the diameter of the circular body portion l4, so that the said sheets provide a band I! which forms a part of the flange l5 and which is of a thickness equal to the thickness of all of the sheets of paper. In assembling the parts, glue is applied between the sheets and each sheet angularly disposed with respect to the previously applied sheet. This causes the corners l8 of the sheets to become distributed throughout the circumference of the bottom structure. By selecting the proper angle uniform distribution of the corners results. Where six sheets are used the angle between like radii of adjacent sheets would be fifteen degrees. Due to the fact that the sheets of paper are square the corners l8 thereofbecome spaced from one another at the extreme marginal portions of the flange. of the said corners overlap each other, the amount of overlap increasing toward the inner periphery of the flange so that the marginal portion of the flange is feathered to a single thickness of paper where the said corners are disposed in spaced relation.

In the formation of the bottom It the sheets 7 are assembled as shown in Fig. 2 and are pressed in suitable dies which forms the flange l5 and the body portion i i, causing said flange to extend outwardly from the body portion. After the bottom has been properly formed the same is allowed to dry or cure which may be accomplished in the open or through the application of heat to the die or by placing the formed bottom in a heated oven. To cause the flange to taper inwardlyto conform to the shape of the wall structure, the formed bottom is forced into a conical hoop and there allowed to remain while drying. If desired, the adhesive used in securing the sheets together maybe limited to the space defined by the dotted line l9 in Fig. 2, which permits the various corners 3 being folded in a manner to attach the bottom to the wall structure of the container. After the bottom has been properly formed and dried the same is removed from the hoop and has the appearance shown in Fig. 3 in which the corners l8 extend outwardly from the extreme end of the flange l5 serving as tongues adapted to be bent with respect to said flange and by means of which the bottom may be secured to the wall structure of the container.

In the construction of the container, a bottom i4 is placed against the edge of a mandrel 2i! constructed to conform to the interior of the container A. The flange 15 of the bottom i4 is of such dimensions that its outer surface lies in continuation of the outer surface of the mandrel 26 as best shown in Fig. 6. With the bottom so held against the mandrel an arcuate sheet of paper ii is applied to the mandrel and wrapped about the same with its lower edge 22 extending circularly about the flange if: at a locality substantially at the end of the portion ll of said flange. The sheet 2! is glued to the flange as the same is applied thereto and the ends of the sheet may be glued together to cause the sheet to be come firmly attached to the flange l5 and to be properly mounted upon said mandrel. Another sheet 23 of exactly the same .form and shape as the sheet 2! is next applied upon sheet 2| with its lower edge 22 coinciding with the lower edge 22 of sheet 2! and secured to said sheet. The

ends of sheet 23 are likewise glued together.

After these two sheets have been properly ap plied the container takes the appearance shown in Fig. 4. At this stage of the construction of the container the feathered portion E6 of the flange i5 is turned back upon the portion of the body structure formed through sheets El and 23 causing the container to take the appearance shown in Fig. 5. As the tongues l8 arev bent back upon the partially formed wall structure, glue is applied to the same, causing said tongues to become glued to the Wall structure and to one another. Where the glue extends only partially along the said tongues, the said tongues are bent readily about the edges 22 of the sheets 2! and Inwardly there- 23 and are caused to fit snugly upon the exterior surface of the body structure. The partially formed container after the tongues have been so disposed takes the appearance shown in Fig. 5.

In the further construction of the container, a number of additional sheets indicated at 24,

25,26 and 2'1 are employed. These sheets are also arcuate in form and are of a height from the upper! to the. lower edge thereof considerably greater than the height of the container so that when the said sheets are applied to the previously formed portion of the wall structure of the container theyproject outwardly beyond the edges 22 ofthe sheets 2! and 23. Sheets 24, 25, 2S and 2! are all of the same size and shape. As the construction of the containerv proceed's,*the sheet 24 is placed upon the sheet 23 with its upper edge coinciding with the upper edge of sheet 23. Sheet 24 is then wrapped about the formed portion of the wall structure and about the feathered portion it of the flange l5 with the extreme ends of the sheet projecting outwardly beyond the edges 22 of sheets 2i and 23.

As sheet 24 is applied the same is glued to the sheet 23 and to the feathered portion is of flange ii and the overlapping ends of sheet 24 also glued together. Thereafter the projecting portion of sheet 24 is turned back over the portion 28 of flange l5 and glued upon the inner surface 29 of said flange. The length of the projecting portion of sheet 24- is such that the free edge 30 of said sheet just falls within the vertex of theangle formed between the body portion l4 of bottom l2 and the flange l5 thereof. After sheet 24 has been so attached to the container, sheets 25 and 26 are individually applied and the projecting marginal portions thereof turned over and secured to the previously applied sheet upon the interior of the'flange 15 of bottom l2. This procedure is continued until all of the sheets have been applied and a wall structure of desired thickness and strength secured, As previously stated, the various sheets employed in the construction of the body of the container are arranged to overlap at the ends. The overlap of the outermost sheet is shown in Fig. 1 and is indicated by the reference numeral 40.

' After the'wall structure has been formed as described the two hoops 3| and 32 are coated upon their inner surfaces with glue and applied to the exterior of the wall structure. 19. The hoop 32 in addition to reinforcing the flange l5 of the bottom it serves to urge the marginal portions of the sheets 24, 25, 26 and 2! against the feathered portion 55 of flange S5 to hold the same firmly in place between the various laminations or sheets constituting the wall structure ill. Inthis manner an extremely rigid construction is provided in which the bottom is firmly secured to the wall structure of the container.

My invention is particularly advantageous in that no waste is encountered in the construction of the bottom used with the container. With my invention the bottom is firmly secured to the wall structure and the tongues formed on the flange thereof imbedded within the wall structure to hold the same securely attached thereto. By wrapping the marginal portions of the outer sheets used in the construction of the wall structure about the flange of the bottom, a unitary onstruction is formed which will resist great strain. With myinvention it becomes unnecessary to employ auxiliary reinforcing members for stiffening the bottom structure. The raw edges of the flange of the bottom are completely cov- 75 ered through the sheets of the wall structure so that fraying is entirely prevented. A container constructed in accordance with my invention can be built at a very low cost. With my invention a perfectly tight joint is formed between the bottom and wall structure so that leakage through the same is entirely prevented. This construction would prevent contamination of the commodity contained within the container in the event that the container should be placed upon a wet surface.

Changes in the specific form of my invention, as herein disclosed, may be made within the scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. In a circular container having a wall structure, a bottom therefor constructed of sheets of paper glued one upon the other to provide a body portion adapted to extend across the lower end of the wall structure and to provide a flange extending downwardly from the body portion, said sheets being constructed with tongues at their edges projecting upwardly from the free end of the flange, said tongues being spaced from one another to cause said tongues to readily accommodate themselves to the contour of the surface of the wall structure to which they are applied.

2. In a circular container having a wall structure formed of a number of layers of paper wrapped about one another and glued together, a bottom therefor constructed of square sheets of paper glued one upon the other and disposed in progressive angular relation with respect to each other to uniformly distribute the corners about the periphery of the bottom, said sheets being formed to provide a body portion adapted to extend across the lower end of the wall structure and a flange connected therewith and embodying the corners of the sheets, said flange being disposed between certain of the layers of the wall structure.

3. In a circular container having a wall structure, a bottom therefor having a body portion extending across the lower end of the wall structure, a flange formed on said bottom and extending along the inner surface of said wall, and a plurality of tongues integral with said flange and extending in the opposite direction from said flange, said tongues being secured to said wall structure.

4. A bottom for a circular container, said bottom comprising a plurality of quadrilateral sheets of paper glued one upon the other and disposed in progressive angular relation with respect to each other to uniformly distribute the corners about the periphery of the bottom, said sheets providing a central body portion and tongues encircling the same without waste of material.

5. A bottom for a circular container, said bottom comprising a plurality of square sheets of paper glued one upon the other and disposed in progressive angular relation, said sheets being so arranged that adjacent corners are angularly spaced a number of degrees equal to ninety degrees divided by the number of sheets used.

6. A bottom structure for paper containers, comprising a plurality of square sheets of paper placed one upon the other and arranged in progressive angular relation with respect to one another, said sheets being glued together and the corners thereof being bent out of the plane of the bottom to form a flange with a feathered edge.

7. In a circular container having a wall structure, a bottom therefor constructed of square sheets of paper glued one upon the other and disposed in progressive angular relation with respect to each other to uniformly distribute the corners about the periphery of the bottom, said sheets being formed to provide a body portion adapted to extend across the lower end of the wall structure and a flange connected therewith and embodying the corners of the sheets.

8. In a circular container having a wall structure, a bottom therefor constructed of square sheets of paper glued one upon the other and disposed in progressive angular relation with respect to each other to uniformly distribute the corners about the periphery of the bottom, said sheets being formed to provide a body portion adapted to extend across the lower end of the wall structure and a flange connected therewith and embodying the corners of the sheets, part of said flange extending downwardly along the inner surface of the wall structure and being secured thereto.

9. In a circular container having a wall structure, a bottom therefor constructed of square sheets of paper glued one upon the other and disposed in progressive angular relation with respect to each other to uniformly distribute the corners about the periphery of the bottom, said sheets being formed to provide a body portion adapted to extend across the lower end of the wall structure and a flange connected therewith and embodying the corners of the sheets, said flange extending downwardly along the inner surface of the wall structure and being secured thereto, the tips formed by the corners of the square sheets extending upwardly from the lowermost edge of the flange and being secured to said wall structure.

10. In a circular container having a wall structure formed of a number of layers of paper wrapped about one another and glued together, a bottom therefor constructed of square sheets of paper glued one upon the other and disposed in progressive angular relation with respect to each other to uniformly distribute the corners about the periphery of the bottom, said sheets being formed to provide a body portion adapted to extend across the lower end of the wall structure and a flange connected therewith and embodying the corners of the sheets, said flange extending downwardly along the inner surface of the wall structure and being secured thereto, the tips formed by the corners of the square sheets extending upwardly from the lowermost edge of the flange and being disposed between certain of the layers of the wall structure,

11. A bottom structure for paper containers comprising a plurality of square sheets of paper placed one upon the other and arranged in progressive angular relation with respect to one another, said sheets being glued together throughout circular areas of a diameter not greater than the width of the sheets.

DAVID C. SHEPARD. 

